Hypodermic syringe



W BRODY ET AL HYPODERMIC SYRINGE Flled July 26 1924 July 13 ,11926.

/1 m It Patented July 13, i226.

VLLIAM BRODY .AN-ID TEOBALDO' Gr. .'BGLDIZZONI, OF NEWT YORK, N. Y.

i-rvronnniurc svninen.

Application filed July 25, 1924. Serial No. 728,469.

Our invention relates to improvements in hypodermic syringes and more especially to means .tor packing the plungers thereof.

Heretofor'e it has been customary to pack the pluiigers of syringes With leather Washers which are very inefficient and as the head must be removed frequently, the Washers become spread'out of shape and must be replaced. It is also a diiicult task to remove the Washers trom Within the syringe. lfvlhen these Washers leak, the liquid VJfrom Within the syringe comes in contact with the hands ofthe'operator and causes painful diseases of the skin.

An important object oic our invention is to do away with these disadvantages.

Another object of our invention is to provide a. device of the above mentioned character which can be readily taken apart and reassembled and which will always have a leakproo joint.

Another object of our invention is the provision of a device of this character which is simple in construction, inexpensive to manufact-ure, and strong and durable in use.

Other objects and advantages of our invention Will be apparent during the course of the followingdescription.

In the accompanying drawings which form a part of this specitication and wherein like4 numerals designate like or corresponding parts throughout the same,

Figure 1 is a side elevation, of a hypodermic syringe equipped With our device, parts being shown in section.

Figure 2 is a similar view of a modified forni of our invention.

Figure 3 is a similar view of another moditication.

Figure 1 is a detail perspective view showing the various parts and their relations, and, v

Figure 5 is a fragmentary sectional view of still another modification.

In the drawings, wherein for the purpose of illustration is shown a preferred eni- 'vbodiment of our invent-ion, the numeral 10 designates the barrel of the usual syringe having the externally screw threaded end portion 11 provided with anopening or recess 12 arranged concentrically of the longitudinal bore or passage 13, through Which the usual plunger 14 operates. Snugly arranged Within the recess 12, and conforming to the shape thereof, is the packing holder 15, Which has an opening 16 to receive the plunger. lelesoopically arranged Within the packing holder 15 is the tightening 'cap The tightening cap has a similar tapered portionV 20, extending in the opposite direction and is also provided with a tapered proyection 21 extending toward the outer yperiphery thereof and extending'a substantial distance beyond the end of the Wall 20, 'i

thereby forming, With the Wall 20, an annular groove substantially ll-shaped in cross section.

The tightening cap 17 is preferably provided with an annular iiange 22 which is flush with the end thereof, and a tightening nut 23 engages the screw threaded end 11 of the barrel of the syringe,

Packing is arranged Within the holder 15 and when the nut is tightened the cap Y 1T Will be :forced into the holder and Will expand the packing. instead of forcing the'packing against the end Walls oi the holder and cap, as usually occurs, the long tapered proJection :21`Will force the packing directly. against the plunger. rlhe tapered Walls wand 2O enable the plunger to be removed and reinserted Without any diilicuity, as they serveto retain the packing Within the holder.

It Will be seen that the packing unit may be remo ved bodily, as shown in Figure L1- to facilitate cleaning, and when the device is ieasseiiibled, the tightening of the nut will expand the packing to form a liquid tight joint, Without the use of a Wrench.

ln the torni shown in Figure 2 the rear Wall of t-liepackiiig holder bears against the face ot the barrel and is provided with a sleeve extension 25 extending into the opening 26 in the barrel. The operation is the saine as in the forni shown in Figure 1.

In the form shown in Figure 3 the packing holder 27 is made integral With t-lie barrel of the syringe.

In the 'forni shown in Figure 5 the position oic the hold-er andcap is reversed and t-he holder is formed integral With the tightening nut 28. rEhe tightening cap 29 tits Within the nut 28 and has its rear face tapered and adapted to fit in a tapered seat 30 inthe end ot the barrel member.

While We have shown and described the preferred embodimentot our invention, it is to be understand that various changes in the size, shape and arrangement oi parts may he resorted te '\\fithout departing; troni the spirit of our invention or the scope ot Athe subjoined claims.

llaringr described eur invention what we c-laini and desire to protect by Letters Pate ent is:

l. The combination with a syringe having a plunger, ott a packing ineinber therefor conlprisingl teleseopiiie` nieinbers, paeling y' ,d between said telescoping` members, s et the telesr'feping members adjacenttne plunger being' tapered in opposite directions towards the plunger 'for retaining the paelring between the telescoping ineinbe when the plunger is withdrawn whereby he plunger may he readily reinserted.

Q. r)The con'ibination with a, plunger, of a packing nieniber therefor comprising a packing' holder, and a tightening Cap telescoping therewith, said tightening' Cap haying a tapered portion adapted to press the packing against the plunger said cap and holder also being provided with oppositely tapered walls said walls tapering towards the plunger for retaining,` the packing between the holder and cap.

3. The combination with aA plunger, of a packing ineinber therefor comprising a packing; holder, and teleseoping' cap adapted to function therewith, said Cap and holder having` oppositely tapered walls said walls tapering,` towards the plunger to retain the packing therebetween when the plunger is withdrawn, whereby the plunger inay be readily reinserted and means carried by said telescoping eap for 'forcing the paeli'ine' directly against the plunger.

4. The, combination with a plunger of a removable packing uint therefor, compris ing a pac-lung' holder having its rear wall tapered towards its open end, and a tightenshaped groove, whereby the packing will be` forced directly against the plunger but will be retained between the telescoping mein,u hers when the plunger is withdrawn, and means to exert-pressure on the tightening cap.

5. 'Ehe combination with a plunger haiving; a recess arranged there about ot a reine'nable packing unit adapted to be arranged in said recess comprising a packing holder having its rear wall tapered towards its open end, a tightening cap telescoping therewith and having' a taperedwall cori'epoudine` to the wall oi' the holder but extending in the opposite direetion, said tightening cap having' its inner wall provided with 'a long taper away troni its outer periphery, thereby terminel an annular V- shaped groove, whereby the packing' will be terced directly against the plunger but will be retained between the teleseopingl ineinbers when the plunger is witln'lrawn` and a nut adapted to be serewed onto the syringe to exert pressure on the tightening' cap and to retain the packing unit in the recess.

ln testimony whereof we affix our signatures.

VILLIAM BRODY. TEOBALDO Gr. BOLDIZZN. 

